spring-mvc - 将 Spring 3 @ExceptionHandler 与公共(public) FileUpload 和 SizeLimitExceededException/MaxUploadSizeExceededException 一起使用

Question

我无法捕捉和优雅地处理公共(public)文件上传的 FileUploadBase.SizeLimitExceededException或 Spring 的MaxUploadSizeExceededException上传大文件时。

据我所知，这些异常是在数据绑定(bind)期间引发的，在实际到达 Controller 之前，因此导致 500 并且没有调用异常处理程序方法。以前有没有人遇到过这种情况，正确处理这些异常的最佳方法是什么？

Answer 1

感谢 thetoolman 提供了这个简单的解决方案。我把它延长了一点。我想保持文件处理不变并将异常传输到 Controller 。

package myCompany; 

public class DropOversizeFilesMultipartResolver extends CommonsMultipartResolver {

    /**
     * Parse the given servlet request, resolving its multipart elements.
     * 
     * Thanks Alexander Semenov @ http://forum.springsource.org/showthread.php?62586
     * 
     * @param request
     *            the request to parse
     * @return the parsing result
     */
    @Override
    protected MultipartParsingResult parseRequest(final HttpServletRequest request) {

        String encoding = determineEncoding(request);
        FileUpload fileUpload = prepareFileUpload(encoding);

        List fileItems;

        try {
            fileItems = ((ServletFileUpload) fileUpload).parseRequest(request);
        } catch (FileUploadBase.SizeLimitExceededException ex) {
            request.setAttribute(EXCEPTION_KEY, ex);
            fileItems = Collections.EMPTY_LIST;
        } catch (FileUploadException ex) {
            throw new MultipartException("Could not parse multipart servlet request", ex);
        }

        return parseFileItems(fileItems, encoding);
    }
}

并在 Controller 中

  @InitBinder("fileForm")
  protected void initBinderDesignForm(WebDataBinder binder) {
    binder.setValidator(new FileFormValidator());
  }

    @RequestMapping(value = "/my/mapping", method = RequestMethod.POST)
  public ModelAndView acceptFile(HttpServletRequest request, Model model, FormData formData,
      BindingResult result) {

    Object exception = request.getAttribute(DropOversizeFilesMultipartResolver.EXCEPTION_KEY);
    if (exception != null && FileUploadBase.SizeLimitExceededException.class.equals(exception.getClass())) {
      result.rejectValue("file", "<your.message.key>");
      LOGGER.error(exception);
    }

Spring 配置保持不变。将异常传输到验证器会非常好，但我还没有弄清楚如何做到这一点。